#include<stdio.h>
#define N 13
struct person
   {int number;
    int nextp;
    }link[N+1];

int main()
   {int i,count,h;
      for(i=1;i<=N;i++)
         {if(i==N)
            link[i].nextp=1;
          else
          link[i].nextp=i+1;
          link[i].number=i;
          }
    printf("\n");
    count=0;
    h=N;
    printf("sequence that persons leave the cricle:\n");
    while(count<N-1)
       {i=0;
        while(i!=3)
         {h=link[h].nextp;
          if(link[h].number)
          i++;
          }
          printf("%4d",link[h].number);
          link[h].number=0;
          count++;
        }
        printf("\nThe last one is:");
        for(i=1;i<=N;i++)
           if(link[i].number)
              printf("%3d",link[i].number);
           printf("\n");
           return 0;
    }
